Abstract

The device performances of light-emitting electrochemical cells are improved by adding a room-temperature molten salt (tetrahexylammonium-bis-trifluoro-methyl-sulfonyl imide) directly into the light-emitting layer. For poly(9,9-dihexyl-fluorene-2,7-diyl) with an indium-tin-oxide anode and an aluminumcathode, the power efficiency can be increased by more than one order of magnitude. An even more pronounced effect is observed for poly Equally important for both luminescent polymers, the operating voltage is drastically reduced.